everyone saying duelist auto is wrong. Im better than most of these comments btw and its really just a matter of utility rather than fight importance.
initiator easily requires the least as the role requires you to be in your util for a lot of fights, and also requires you to comm more.
Controller is like slightly less than the other roles as you do have to be in your util often.
Sentinel actually requires a lot of aim as you take a lot of fights solo rather than with help from your team. Also aim is more important in clutches than in a 5v5 because a lot of util has been used already.
Duelist take a lot of important fights but they play with the team often. Duelists have to focus less on winning duels and taking space/being tradable.
Best agents for pure aimers: Jett, Sage, Kj, Chamber